/Engine/Source/Editor/GameProjectGeneration/Public/AddToProjectConfig.h
Optional argument that specifies the prefix for the new class name. The user will be able to type their own name if they don't like this name. Defaults to "My" if not specified or empty.
[FAddToProjectConfig](API\Editor\GameProjectGeneration\FAddToProjectConfig) & DefaultClassPrefix ( [FString](API\Runtime\Core\Containers\FString) InDefaultClassPrefix )